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In the other four clinics, the ADHD and control groups had the same average IQ (with the mean IQ scores for both groups within two points of each other.) Thus, at all 20 sites, the ADHD group had a mean IQ score that was equal to, or higher than, the mean IQ score for the control group.Now the usual assumption is that ADHD children, suffering from a “brain disorder,” are less able to concentrate and focus in school, and thus are cognitively impaired in some way.To discover this finding, you need to spend $31.50 to purchase the article, and then make a special request to to send you the appendix.Then you will discover, on pages 7 to 9 in the appendix, a “Table 2” that provides IQ scores for both the ADHD cohort and the controls.The authors of this study told of findings that show ADHD is a of the brain.But if the mean IQ score of the ADHD cohort is higher than the mean score for the controls, doesn’t this basic assumption need to be reassessed?

In the study, Martine Hoogman and her 81 co-authors conducted a secondary data analysis of MRI scans used to measure brain volumes in 1713 patients diagnosed with ADHD and 1529 individuals who did not have this diagnosis.Does the study support the conclusion that children and adults with ADHD have “altered brains,” as evidenced by smaller volumes in different regions of the brain?And did the authors present data that convincingly “refutes” earlier studies suggesting that medication exposure may be a cause of smaller brain volumes?According to the paper’s 82 authors, the study provides definitive evidence that individuals with ADHD have altered, smaller brains.